The ES-52 is a bayonet-mount type lens hood specifically made to fit the Canon EF 40mm f/2.8 STM lens.

Not so sure about that, or at least, it's not a compllete description. I don't see any place on the lens for a bayonet type hood to mount, and I suspect it's a screw-in hood, or it comes with a screw-in hood adapter like the 50/1.8 II.

Just picked up my shorty forty here in shanghai. It comes with the tiny lens case LP811 and the ridiculously cute ES-52 lens hood, which as Neuro points out, is a screw-in hood. It's so small that I first didn't realize it is actually a hood. Screwed in, it only protrudes 8mm!

Did it 'come' with it or were those items separate purchases? Because mine comes tomorrow and I bet you it is only a lens in a styro and cardboard box.

yup if you ordered it in the US, then it just comes in a styro and cardboard box. Got mine already, loving this lens!

The hood is made of aluminium and is actually very nice. It does protect the small front element quite well despite its tiny size, mainly because the hood has an opening that is rather narrow. However, the lens will extend when focussing, and the hood is mounted on the moving front part, so it will not protect the moving mechanism like the hood on the 50mm 1.4 does.

I'd say either put a slim UV filter or the ES-52 hood on for protection. No point having both. Also, stacking both makes the lens quite a bit bigger. And we did buy it for its tiny size, no?

canon rumors FORUM

I have an old metal Hoya lens hood which I used to use on a 35mm lens that looks perfect on it but it nearly doubles the length, so although no darkening don't like it. Also can't put lens cap on when in bag, using a filter.

What's the real amount of protection you get with this anyway? Think of the amount of ways the lens could actually be impacted and saved by a 8mm lip that protrudes less than the actual distance from the glass to where the hood starts... I mean, you'd have to hit literally hit a surface exactly head on and even then, is it really any more protected than it is without the hood?

And what light source is it going to protect from flare? A laser thin strip of light coming in from almost perpendicular to the lens surface?

Id be interested to see if something so seemingly insignificant really makes a difference. A before and after shot would be awesome...

... The 50 1.8 hood might be an option for more extreme situations (mosh pits and the like). Can the lens cap be used while the hood is attached? I assume the hood can not be reversed like the bayonet types can be?

I have the Vello ES62 hood (pretty much identical to the Canon version) for the 50 f/1.8 II and it does indeed work on the 40mm. Yes, the lens cap can be used while hood is attached. And yes, the hood can be reversed.